diff --git a/packages/secubox-toolbox-ng/cmd/sbxmitm/main.go b/packages/secubox-toolbox-ng/cmd/sbxmitm/main.go
index dd13c58d..653611ff 100644
--- a/packages/secubox-toolbox-ng/cmd/sbxmitm/main.go
+++ b/packages/secubox-toolbox-ng/cmd/sbxmitm/main.go
@@ -210,6 +210,14 @@ type Proxy struct {
 	// analysis sidecar sockets (#662 — restoring the "Qui te piste?" events the
 	// decommissioned Python addons fed). Default on; relay.go is the transport.
 	analysisRelay bool
+
+	// socialRelay gates the cross-site cookie-tracker correlation (#662 — restoring
+	// the kbin /social graph the decommissioned Python social_graph addon fed).
+	// Default on. social.go is the engine; edges are batched + POSTed to the
+	// portal's /__toolbox/social-event ingest. nil → off (CONNECT PoC / tests).
+	socialRelayOn bool
+	social        *socialRelay
+	consent       *consentLog
 }
 
 // recordAdBlock forwards a 204'd ad/tracker block to the engine's metrics
@@ -378,6 +386,12 @@ func (px *Proxy) mitmPipeline(tconn *tls.Conn, rawClient net.Conn, host, verdict
 		// per-client breakdown keys on the WG persona hash. recordAdBlock is
 		// O(1) and never blocks the block path.
 		px.recordAdBlock(host, refererSite(req.Header.Get("Referer")), clientHashFromConn(rawClient))
+		// #662 — the cross-site tracking evidence lives PRECISELY on the blocked
+		// trackers: the browser still SENT its 3rd-party Cookie to doubleclick/
+		// adnxs/… before we 204 it. Correlate that request-Cookie here (resp=nil,
+		// request-only) or the /social graph misses the very trackers it exists to
+		// expose. Hash-only, WG-peer only, fire-and-forget — same as the allow path.
+		px.emitSocial(peerIP(rawClient), host, req, nil)
 		writeRaw(tconn, 204, "No Content", map[string]string{"X-SecuBox-Ng": "blocked"}, nil)
 		return
 	}
@@ -447,6 +461,17 @@ func (px *Proxy) mitmPipeline(tconn *tls.Conn, rawClient net.Conn, host, verdict
 	// relayed names byte-for-byte the origin's. Fire-and-forget, gated.
 	px.emitCookies(relayIP, clientHash, req, resp)
 
+	// #662 — cross-site cookie-tracker correlation (restores the kbin /social
+	// graph). FAITHFUL to the decommissioned Python social_graph addon: extract
+	// 3rd-party cookie edges (Set-Cookie + request Cookie), hash the identifier
+	// (cookieIDHash — NEVER the raw value), classify consent_state, and buffer
+	// them for the batched POST to the portal /__toolbox/social-event ingest.
+	// Like the addon, this ONLY fires for known R3 WG peers (macHashOf, not the
+	// raw-IP fallback): non-WG flows yield no edges. allow|mitm only (the block
+	// 204 / splice paths return before here). Gated by --social-relay; pure +
+	// non-blocking (the flush is a background goroutine).
+	px.emitSocial(relayIP, host, req, resp)
+
 	// Poison: only on MITM'd tracker flows (never on allow/own-infra), and only
 	// when the jar key is loaded. Replaces tracking-id Set-Cookie values with a
 	// stable fabricated persona; benign cookies pass through untouched.
@@ -515,6 +540,8 @@ func main() {
 		"CONSENTED DEMONSTRATION: relax a page's CSP so the injected transparency-banner loader runs even on strict-CSP sites, and flag the bypass (banner shows 🔓). Only on injected 2xx text/html R3 responses; never on non-injected responses. Set false to never touch CSP.")
 	analysisRelay := flag.Bool("analysis-relay", true,
 		"relay per-flow telemetry (dpi/cookies/ja4) to the analysis sidecar sockets so the kbin \"Qui te piste?\" events refill (#662; replaces the decommissioned Python relay addons). Fire-and-forget; a dead/slow sidecar never affects the proxy. Set false to emit nothing.")
+	socialRelay := flag.Bool("social-relay", true,
+		"compute cross-site cookie-tracker edges and POST them to the portal /__toolbox/social-event ingest so the kbin /social graph refills (#662; replaces the decommissioned Python social_graph addon). Hash-only (never raw cookie values); WG-peer flows only; batched + fire-and-forget — a dead/slow portal never affects the proxy. Set false to emit nothing.")
 	flag.Parse()
 	ca, err := loadCA(*caCert, *caKey)
 	if err != nil {
@@ -545,7 +572,16 @@ func main() {
 		cspDemo: *cspDemo,
 
 		analysisRelay: *analysisRelay,
+
+		socialRelayOn: *socialRelay,
+		social:        newSocialRelay(),
+		consent:       newConsentLog(),
 	}
+	// #662 — start the social-edge flusher: the MITM path buffers cross-site
+	// tracker edges into px.social, drained every 10s to the portal's
+	// /__toolbox/social-event (best-effort, fire-and-forget) so the kbin /social
+	// graph (frozen since the cutover) refills.
+	go px.social.runFlusher(*portal)
 	// #662 — start the ad-block metrics flusher: the block path tallies every
 	// 204 into px.ads, drained every 10s to the portal's /__toolbox/ad-event
 	// (best-effort, fire-and-forget) so the #ads dashboard sees blocks again.
diff --git a/packages/secubox-toolbox-ng/cmd/sbxmitm/sidecar.go b/packages/secubox-toolbox-ng/cmd/sbxmitm/sidecar.go
index d799b6e8..9e537da9 100644
--- a/packages/secubox-toolbox-ng/cmd/sbxmitm/sidecar.go
+++ b/packages/secubox-toolbox-ng/cmd/sbxmitm/sidecar.go
@@ -18,7 +18,9 @@
 //	avatar    →   /run/secubox/avatar.sock          POST /fingerprint
 //	ja4       →   /run/secubox/threat-analyst.sock  POST /ja4
 //	soc_relay →   /run/secubox/soc.sock             POST /event
-//	social_graph: in-process (no socket) — correlated inside the engine, not emitted.
+//	social_graph: correlated in-process (social.go) — edges (hash-only, never raw
+//	  cookie values) are NOT emitted to a module socket but POSTed to the portal
+//	  /__toolbox/social-event ingest (the social store lives in the toolbox/portal).
 //
 // emit takes the full socket PATH (not an http+unix:// URL) plus the route in
 // the payload's destination; callers build the path from the table above.
diff --git a/packages/secubox-toolbox-ng/cmd/sbxmitm/social.go b/packages/secubox-toolbox-ng/cmd/sbxmitm/social.go
new file mode 100644
index 00000000..0ff60bf3
--- /dev/null
+++ b/packages/secubox-toolbox-ng/cmd/sbxmitm/social.go
@@ -0,0 +1,605 @@
+// SPDX-License-Identifier: LicenseRef-CMSD-1.0
+// Copyright (c) 2026 CyberMind — Gérald Kerma <devel@cybermind.fr>
+//
+// SecuBox-Deb :: toolbox-ng :: cross-site cookie-tracker correlation (#662)
+//
+// Restores the kbin "/social" cross-site tracker graph, frozen since the #662
+// Phase-7 cutover decommissioned the in-process Python `social_graph` addon
+// (packages/secubox-toolbox/mitmproxy_addons/social_graph.py). The graph reads
+// social_nodes/social_links in toolbox.db, folded from raw social_edges — and
+// the edges stopped flowing when the Python addon was retired.
+//
+// This is a FAITHFUL Go port of the addon's correlation logic:
+//   - cookieIDHash : byte-exact port of social.cookie_id_hash (Python = source
+//     of truth, proven by social_test.go ↔ tests/test_social_parity.py over a
+//     shared fixture — the same anti-rig discipline as jar.go).
+//   - isDenyListed + the _DEFAULT_DENY_COOKIES set (social.py).
+//   - registrableSocial : the addon's _registrable_domain eTLD+1 helper
+//     (DIFFERENT from policy.go's registrable() — IP literals pass through,
+//     no port strip, a larger multi-label-TLD table; the graph correctness
+//     depends on this exact flavour, so it is replicated verbatim and NOT
+//     consolidated with policy.registrable).
+//   - the 3rd-party decision (tracker_domain != src_site on eTLD+1) on BOTH the
+//     response Set-Cookie path and the request Cookie path, mirroring the
+//     addon's response()+request hooks.
+//   - the CMP consent-platform detection → consent_state ∈ {none_seen,
+//     pre_consent, post_consent} via a per-(peer,site) in-memory log.
+//
+// Privacy/CSPN invariant (the reason the original ran in-process): raw cookie
+// VALUES NEVER leave the engine — only the truncated SHA-256 cookieIDHash is
+// emitted. The edges are POSTed fire-and-forget to the portal's
+// /__toolbox/social-event ingest (sibling of /__toolbox/ad-event), which calls
+// social.record_edge(). Best-effort throughout; a dead/slow portal can never
+// block or delay a client flow.
+//
+// Pure standard library — no external modules, no go.sum.
+package main
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"log"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+)
+
+// ── registrableSocial: port of social_graph._registrable_domain ─────────────
+//
+// Python (mitmproxy_addons/social_graph.py):
+//
+//	h = (host or "").lower().strip(".")
+//	if not h or h.replace(".", "").isdigit(): return h     # raw IP → as-is
+//	parts = h.split(".")
+//	if len(parts) < 2: return h
+//	last_two = ".".join(parts[-2:])
+//	if last_two in _MULTI_LABEL_TLDS and len(parts) >= 3: return ".".join(parts[-3:])
+//	return last_two
+//
+// This DIFFERS from policy.registrable (ad_ghost flavour): no port strip, IP
+// literals pass through unchanged (the store later drops IP trackers via
+// _is_ip), and the multi-label-TLD table below is the addon's larger set. The
+// graph's 3rd-party comparison is done with THIS function, so it must match the
+// addon exactly.
+var socialMultiLabelTLDs = map[string]bool{
+	"co.uk": true, "ac.uk": true, "gov.uk": true, "org.uk": true, "net.uk": true,
+	"co.jp": true, "ne.jp": true, "ac.jp": true,
+	"com.au": true, "net.au": true, "org.au": true,
+	"com.br": true, "com.cn": true, "com.hk": true, "com.tw": true, "com.mx": true,
+}
+
+func registrableSocial(host string) string {
+	h := strings.Trim(strings.ToLower(host), ".")
+	if h == "" {
+		return h
+	}
+	// h.replace(".","").isdigit() → all-digit (IPv4-ish) → return as-is.
+	if isAllDigits(strings.ReplaceAll(h, ".", "")) {
+		return h
+	}
+	parts := strings.Split(h, ".")
+	if len(parts) < 2 {
+		return h
+	}
+	last2 := strings.Join(parts[len(parts)-2:], ".")
+	if socialMultiLabelTLDs[last2] && len(parts) >= 3 {
+		return strings.Join(parts[len(parts)-3:], ".")
+	}
+	return last2
+}
+
+// ── cookieIDHash: BYTE-EXACT port of social.cookie_id_hash ───────────────────
+//
+// Python (secubox_toolbox/social.py):
+//
+//	h = sha256()
+//	h.update(tracker_domain.lower().encode("utf-8","replace")); h.update(b"\x00")
+//	h.update(cookie_name.lower().encode("utf-8","replace"));    h.update(b"\x00")
+//	h.update(cookie_value.encode("utf-8","replace"))
+//	return h.hexdigest()[:16]
+//
+// CRITICAL: tracker_domain + cookie_name are LOWER-cased; the cookie_value is
+// NOT. NUL (0x00) separators between the three fields. Go strings are already
+// UTF-8, and strings.ToLower is byte-identical to Python str.lower for the
+// ASCII + Latin domain/name inputs the fixtures exercise (incl. the Ünîcödé
+// case, verified at parity). hex of the first 8 digest bytes == hexdigest()[:16].
+func cookieIDHash(trackerDomain, cookieName, cookieValue string) string {
+	h := sha256.New()
+	h.Write([]byte(strings.ToLower(trackerDomain)))
+	h.Write([]byte{0x00})
+	h.Write([]byte(strings.ToLower(cookieName)))
+	h.Write([]byte{0x00})
+	h.Write([]byte(cookieValue)) // value NOT lower-cased
+	sum := h.Sum(nil)
+	return hex.EncodeToString(sum)[:16]
+}
+
+// ── deny-list: port of social._DEFAULT_DENY_COOKIES + is_deny_listed ─────────
+//
+// Names whose presence on a flow is NEVER recorded as a tracker identifier
+// (session / csrf / auth / cloudflare / consent / locale). Replicated verbatim
+// from social.py; matched case-insensitively after trimming.
+var socialDenyCookies = map[string]bool{
+	// session
+	"phpsessid": true, "jsessionid": true, "asp.net_sessionid": true, "ci_session": true,
+	"express.sid": true, "connect.sid": true, "sails.sid": true, "django_session": true,
+	"laravel_session": true, "flask_session": true, "session": true, "sessionid": true,
+	// csrf
+	"_csrf": true, "_csrf_token": true, "xsrf-token": true, "csrftoken": true, "csrf": true,
+	"x-csrf-token": true, "anti-csrf-token": true,
+	// auth (1st-party)
+	"auth": true, "auth_token": true, "access_token": true, "refresh_token": true, "bearer": true,
+	"remember_token": true, "remember_me": true, "_oauth2_proxy": true,
+	// cloudflare / consent / locale (low signal)
+	"__cf_bm": true, "cf_clearance": true, "consent": true, "cookieconsent_status": true,
+	"locale": true, "lang": true, "language": true, "_locale": true,
+}
+
+// isDenyListed mirrors social.is_deny_listed (default-deny set only; the engine
+// does not load the TOML extra_deny override). An empty name is deny-listed
+// (Python returns True for a blank name).
+func isDenyListed(cookieName string) bool {
+	name := strings.ToLower(strings.TrimSpace(cookieName))
+	if name == "" {
+		return true
+	}
+	return socialDenyCookies[name]
+}
+
+// ── cookie parsers: port of _parse_set_cookie / _parse_cookie_header ─────────
+
+// parseSetCookieNameValue mirrors social_graph._parse_set_cookie: name=value is
+// the text up to the first ';'; the name is everything before the first '=',
+// trimmed; the value is the rest of that first field, trimmed. Returns ok=false
+// for an attribute-only / nameless / empty line.
+func parseSetCookieNameValue(header string) (name, value string, ok bool) {
+	field := header
+	if i := strings.IndexByte(field, ';'); i >= 0 {
+		field = field[:i]
+	}
+	eq := strings.IndexByte(field, '=')
+	if eq < 0 {
+		return "", "", false
+	}
+	name = strings.TrimSpace(field[:eq])
+	value = strings.TrimSpace(field[eq+1:])
+	if name == "" {
+		return "", "", false
+	}
+	return name, value, true
+}
+
+// cookiePair is one (name,value) parsed from a request Cookie header.
+type cookiePair struct{ name, value string }
+
+// parseCookieHeader mirrors social_graph._parse_cookie_header: split on ';',
+// each "name=value" yields a trimmed (name,value); nameless pairs are dropped.
+func parseCookieHeader(header string) []cookiePair {
+	var out []cookiePair
+	for _, part := range strings.Split(header, ";") {
+		eq := strings.IndexByte(part, '=')
+		if eq < 0 {
+			continue
+		}
+		name := strings.TrimSpace(part[:eq])
+		value := strings.TrimSpace(part[eq+1:])
+		if name != "" {
+			out = append(out, cookiePair{name: name, value: value})
+		}
+	}
+	return out
+}
+
+// extractSetCookieDomainAttr mirrors social_graph._extract_domain_attr: pull the
+// "; Domain=…" attribute from a Set-Cookie line, trimmed, leading dot stripped,
+// lower-cased. Returns "" when absent.
+func extractSetCookieDomainAttr(setCookie string) string {
+	low := strings.ToLower(setCookie)
+	idx := strings.Index(low, "domain")
+	for idx >= 0 {
+		// require it to be an attribute (preceded by ';' after optional spaces),
+		// mirroring the Python regex `;\s*domain\s*=`.
+		j := idx + len("domain")
+		// skip spaces, then '='
+		k := j
+		for k < len(setCookie) && (setCookie[k] == ' ' || setCookie[k] == '\t') {
+			k++
+		}
+		if k < len(setCookie) && setCookie[k] == '=' {
+			// confirm a ';' (or start) precedes `domain` (after spaces).
+			p := idx - 1
+			for p >= 0 && (setCookie[p] == ' ' || setCookie[p] == '\t') {
+				p--
+			}
+			if p < 0 || setCookie[p] == ';' {
+				rest := setCookie[k+1:]
+				if e := strings.IndexByte(rest, ';'); e >= 0 {
+					rest = rest[:e]
+				}
+				val := strings.ToLower(strings.TrimLeft(strings.TrimSpace(rest), "."))
+				if val == "" {
+					return ""
+				}
+				return val
+			}
+		}
+		next := strings.Index(low[idx+1:], "domain")
+		if next < 0 {
+			return ""
+		}
+		idx = idx + 1 + next
+	}
+	return ""
+}
+
+// srcSiteFromReferer mirrors social_graph._src_site_from_referer: take Referer
+// (else Origin), strip scheme/path/query, return registrableSocial of the host.
+func srcSiteFromReferer(req *http.Request) string {
+	ref := req.Header.Get("Referer")
+	if ref == "" {
+		ref = req.Header.Get("Origin")
+	}
+	if ref == "" {
+		return ""
+	}
+	s := ref
+	if i := strings.Index(s, "://"); i >= 0 {
+		s = s[i+3:]
+	}
+	if i := strings.IndexByte(s, '/'); i >= 0 {
+		s = s[:i]
+	}
+	if i := strings.IndexByte(s, '?'); i >= 0 {
+		s = s[:i]
+	}
+	return registrableSocial(s)
+}
+
+// ── consent-state detection: port of the _consent_log machinery ──────────────
+//
+// CMP (Consent Management Platform) cookie name prefixes + loader URL fragments,
+// verbatim from social_graph._CMP_COOKIE_PREFIXES / _CMP_LOADER_FRAGMENTS. Seen
+// on a flow → the site runs a CMP (has_cmp) and, for a cookie, consent recorded
+// (consented). consent_state classifies a tracker edge as pre/post/none-consent.
+var cmpCookiePrefixes = []string{
+	"optanonconsent", "onetrustconsent", "optanonalertboxclosed", // OneTrust
+	"didomi_token", "euconsent-v2", // Didomi / IAB TCF
+	"__qca", "quantcast", // Quantcast
+	"sp_choice", "consentuid", "_sp_", // Sourcepoint
+}
+
+var cmpLoaderFragments = []string{
+	"cdn.cookielaw.org", "onetrust.com", // OneTrust
+	"sdk.privacy-center.org", "didomi.io", // Didomi
+	"quantcast.mgr.consensu.org", "quantcast.com/choice", // Quantcast
+	"sourcepoint.mgr.consensu.org", "sp-prod.net", // Sourcepoint
+}
+
+// consentObservation is the per-(peer,site) state, mirroring the Python dict
+// {"has_cmp": bool, "consented": bool}.
+type consentObservation struct {
+	hasCMP    bool
+	consented bool
+}
+
+// consentKey mirrors social_graph._consent_key = (mac_hash, site).
+type consentKey struct{ macHash, site string }
+
+// consentLog is the bounded in-memory per-(peer,site) observation log, mirroring
+// the module-level _consent_log + its 20k soft-cap wholesale clear. The Go proxy
+// is genuinely concurrent (Python relied on the GIL), so all access is
+// mutex-guarded.
+type consentLog struct {
+	mu  sync.Mutex
+	log map[consentKey]consentObservation
+}
+
+const consentLogCap = 20000 // mirrors social_graph._consent_log soft cap
+
+func newConsentLog() *consentLog {
+	return &consentLog{log: map[consentKey]consentObservation{}}
+}
+
+// update mirrors social_graph._update_consent_log: observe whether this flow
+// reveals a CMP loader (URL fragment, both request and response side) or a CMP
+// cookie (either direction) for the (peer,site) pair, and fold it into the log.
+//   - url is flow.request.pretty_url (lower-cased here).
+//   - cookieBlobs are the raw request Cookie + response Set-Cookie header lines.
+func (cl *consentLog) update(macHash, site, url string, cookieBlobs []string) {
+	cl.mu.Lock()
+	defer cl.mu.Unlock()
+	if len(cl.log) > consentLogCap {
+		cl.log = map[consentKey]consentObservation{}
+	}
+	key := consentKey{macHash: macHash, site: site}
+	st := cl.log[key]
+
+	lurl := strings.ToLower(url)
+	for _, frag := range cmpLoaderFragments {
+		if strings.Contains(lurl, frag) {
+			st.hasCMP = true
+			break
+		}
+	}
+	for _, blob := range cookieBlobs {
+		low := strings.ToLower(blob)
+		for _, pref := range cmpCookiePrefixes {
+			if strings.Contains(low, pref) {
+				st.hasCMP = true
+				st.consented = true
+				break
+			}
+		}
+	}
+	cl.log[key] = st
+}
+
+// stateFor mirrors social_graph._consent_state_for: post_consent if a consent
+// cookie was seen here, pre_consent if a CMP is present but no consent cookie
+// yet, none_seen otherwise.
+func (cl *consentLog) stateFor(macHash, site string) string {
+	cl.mu.Lock()
+	defer cl.mu.Unlock()
+	st, ok := cl.log[consentKey{macHash: macHash, site: site}]
+	if !ok {
+		return "none_seen"
+	}
+	if st.consented {
+		return "post_consent"
+	}
+	if st.hasCMP {
+		return "pre_consent"
+	}
+	return "none_seen"
+}
+
+// ── edge extraction: port of SocialGraph.response()+request() hook logic ──────
+
+// socialEdge is one cross-site tracker edge, mirroring the kwargs the Python
+// social.record_edge accepts; serialised straight into the ingest batch.
+type socialEdge struct {
+	ClientMacHash   string `json:"client_mac_hash"`
+	SrcSite         string `json:"src_site"`
+	TrackerDomain   string `json:"tracker_domain"`
+	CookieIDHashVal string `json:"cookie_id_hash_val"`
+	JA4Hash         string `json:"ja4_hash,omitempty"`
+	ConsentState    string `json:"consent_state"`
+}
+
+// socialEdgesFor extracts the cross-site tracker edges for ONE MITM'd flow,
+// mirroring SocialGraph.response() + the request-Cookie tail. Pure (no I/O): the
+// caller emits the returned edges. macHash MUST be the WG persona hash (the
+// addon only fires for known R3 peers — empty macHash yields no edges). reqHost
+// is flow.request.host; reqURL is flow.request.pretty_url (for CMP loader
+// detection); ja4 is the captured fingerprint (may be "").
+//
+// Decision logic, faithful to the addon:
+//   - src_site = registrableSocial(reqHost); skip if empty.
+//   - update the consent log for (macHash, src_site), derive consent_state.
+//   - Set-Cookie path (first 50): for each non-deny-listed cookie, tracker_domain
+//     = registrableSocial(Domain= attr OR reqHost); emit IFF tracker_domain != ""
+//     and != src_site (3rd-party).
+//   - Cookie path: only when a Referer/Origin context site exists and differs
+//     from the tracker (= registrableSocial(reqHost)); cap 5 Cookie headers ×
+//     50 pairs; emit per non-deny-listed cookie with the context site's
+//     consent_state.
+func socialEdgesFor(macHash string, req *http.Request, resp *http.Response, reqHost, reqURL, ja4 string, cl *consentLog) []socialEdge {
+	if macHash == "" || cl == nil {
+		return nil
+	}
+	srcSite := registrableSocial(reqHost)
+	if srcSite == "" {
+		return nil
+	}
+
+	// Gather the cookie blobs (both directions) for the CMP cookie check, then
+	// fold the consent observation BEFORE deriving consent_state (matches the
+	// addon's ordering: _update_consent_log then _consent_state_for).
+	var setCookies []string
+	if resp != nil {
+		setCookies = resp.Header.Values("Set-Cookie")
+	}
+	var reqCookies []string
+	if req != nil {
+		reqCookies = req.Header.Values("Cookie")
+	}
+	blobs := make([]string, 0, len(reqCookies)+len(setCookies))
+	blobs = append(blobs, reqCookies...)
+	blobs = append(blobs, setCookies...)
+	cl.update(macHash, srcSite, reqURL, blobs)
+	consentState := cl.stateFor(macHash, srcSite)
+
+	var edges []socialEdge
+
+	// Set-Cookie path — first 50 lines (matches the addon's [:50]).
+	for i, sc := range setCookies {
+		if i >= 50 {
+			break
+		}
+		name, value, ok := parseSetCookieNameValue(sc)
+		if !ok || isDenyListed(name) {
+			continue
+		}
+		domainAttr := extractSetCookieDomainAttr(sc)
+		issuer := domainAttr
+		if issuer == "" {
+			issuer = reqHost
+		}
+		trackerDomain := registrableSocial(issuer)
+		if trackerDomain == "" || trackerDomain == srcSite {
+			continue // 1st-party Set-Cookie: not a cross-site tracker signal.
+		}
+		edges = append(edges, socialEdge{
+			ClientMacHash:   macHash,
+			SrcSite:         srcSite,
+			TrackerDomain:   trackerDomain,
+			CookieIDHashVal: cookieIDHash(trackerDomain, name, value),
+			JA4Hash:         ja4,
+			ConsentState:    consentState,
+		})
+	}
+
+	// Request-Cookie path — only when this request is itself for a 3rd-party
+	// tracker and we have a differing 1st-party context from the Referer/Origin.
+	if len(reqCookies) == 0 {
+		return edges
+	}
+	trackerDomain := registrableSocial(reqHost)
+	if trackerDomain == "" {
+		return edges
+	}
+	ctxSite := srcSiteFromReferer(req)
+	if ctxSite == "" || ctxSite == trackerDomain {
+		return edges
+	}
+	ctxConsent := cl.stateFor(macHash, ctxSite)
+	for i, hdr := range reqCookies {
+		if i >= 5 { // addon caps Cookie headers at [:5]
+			break
+		}
+		pairs := parseCookieHeader(hdr)
+		for j, p := range pairs {
+			if j >= 50 { // and pairs at [:50]
+				break
+			}
+			if isDenyListed(p.name) {
+				continue
+			}
+			edges = append(edges, socialEdge{
+				ClientMacHash:   macHash,
+				SrcSite:         ctxSite,
+				TrackerDomain:   trackerDomain,
+				CookieIDHashVal: cookieIDHash(trackerDomain, p.name, p.value),
+				JA4Hash:         ja4,
+				ConsentState:    ctxConsent,
+			})
+		}
+	}
+	return edges
+}
+
+// ── relay: batch + POST to the portal /__toolbox/social-event ingest ─────────
+
+const (
+	socialFlushInterval = 10 * time.Second // drain cadence (sibling of adFlushInterval)
+	socialBatchCap      = 5000             // max edges held between flushes (drop excess)
+)
+
+// socialEventPayload mirrors the portal /__toolbox/social-event JSON contract.
+type socialEventPayload struct {
+	Edges []socialEdge `json:"edges"`
+}
+
+func (p socialEventPayload) empty() bool { return len(p.Edges) == 0 }
+
+// socialRelay buffers extracted edges and flushes them to the portal. Bounded:
+// once the buffer holds socialBatchCap edges, NEW edges are dropped until the
+// next flush clears it (a dead portal can never grow memory unbounded). Edges
+// carry ONLY the cookieIDHash — never raw values (privacy/CSPN).
+type socialRelay struct {
+	mu  sync.Mutex
+	buf []socialEdge
+}
+
+func newSocialRelay() *socialRelay { return &socialRelay{} }
+
+// add appends edges to the buffer under the cap. Never blocks the flow.
+func (s *socialRelay) add(edges ...socialEdge) {
+	if len(edges) == 0 {
+		return
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, e := range edges {
+		if len(s.buf) >= socialBatchCap {
+			return
+		}
+		s.buf = append(s.buf, e)
+	}
+}
+
+// snapshot atomically reads-and-clears the buffer.
+func (s *socialRelay) snapshot() socialEventPayload {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if len(s.buf) == 0 {
+		return socialEventPayload{}
+	}
+	p := socialEventPayload{Edges: s.buf}
+	s.buf = nil
+	return p
+}
+
+// socialEventClient is the short-timeout fire-and-forget client for the
+// social-event POST (sibling of adEventClient). Never follows redirects (SSRF
+// hygiene); tight timeout so a slow portal can't stall the flusher.
+var socialEventClient = &http.Client{
+	Timeout:       5 * time.Second,
+	CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse },
+}
+
+// flushOnce snapshots the buffer and, if non-empty, POSTs it to the portal's
+// /__toolbox/social-event ingest. Best-effort: any error is swallowed with at
+// most a log line — the engine must never block on the portal. Returns the
+// flushed payload so the test can assert the snapshot/clear + shape.
+func (s *socialRelay) flushOnce(portal string) socialEventPayload {
+	p := s.snapshot()
+	if p.empty() {
+		return p
+	}
+	buf, err := json.Marshal(p)
+	if err != nil {
+		log.Printf("social-event marshal failed: %v", err)
+		return p
+	}
+	url := portalTargetURL(portal, "/__toolbox/social-event")
+	resp, err := socialEventClient.Post(url, "application/json", bytes.NewReader(buf))
+	if err != nil {
+		log.Printf("social-event post failed for %s: %v", url, err)
+		return p
+	}
+	resp.Body.Close()
+	return p
+}
+
+// ── proxy wiring ──────────────────────────────────────────────────────────
+
+// socialEnabled reports whether cross-site correlation is on (--social-relay →
+// Proxy.socialRelayOn, with the buffer + consent log allocated). Nil-safe so the
+// CONNECT PoC / tests that build a bare Proxy can call it.
+func (px *Proxy) socialEnabled() bool {
+	return px != nil && px.socialRelayOn && px.social != nil && px.consent != nil
+}
+
+// emitSocial extracts the cross-site tracker edges for a MITM'd flow and buffers
+// them for the batched portal POST. clientIP is the client's peer IP; the per-
+// client identity is the WG persona hash (macHashOf) — NOT the raw-IP fallback,
+// so non-WG flows produce no edges, exactly like the Python addon's
+// _client_mac_hash gate. Gated, pure (the buffer.add is O(1) under a short
+// mutex), never blocks the flow. reqURL feeds the CMP loader-fragment check.
+func (px *Proxy) emitSocial(clientIP, host string, req *http.Request, resp *http.Response) {
+	if !px.socialEnabled() || req == nil {
+		return
+	}
+	macHash := macHashOf(clientIP)
+	if macHash == "" {
+		return // known R3 WG peers only (addon: `if not mac_hash: return`)
+	}
+	reqURL := req.URL.String()
+	edges := socialEdgesFor(macHash, req, resp, host, reqURL, "", px.consent)
+	px.social.add(edges...)
+}
+
+// runFlusher is the background flusher goroutine: every socialFlushInterval it
+// drains the buffer to the portal. Start once from main(); runs for the process
+// lifetime.
+func (s *socialRelay) runFlusher(portal string) {
+	t := time.NewTicker(socialFlushInterval)
+	defer t.Stop()
+	for range t.C {
+		s.flushOnce(portal)
+	}
+}
diff --git a/packages/secubox-toolbox-ng/cmd/sbxmitm/social_test.go b/packages/secubox-toolbox-ng/cmd/sbxmitm/social_test.go
new file mode 100644
index 00000000..0e51195d
--- /dev/null
+++ b/packages/secubox-toolbox-ng/cmd/sbxmitm/social_test.go
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: LicenseRef-CMSD-1.0
+// Copyright (c) 2026 CyberMind — Gérald Kerma <devel@cybermind.fr>
+//
+// Cross-engine SOCIAL parity + decision harness — Go side (#662).
+//
+// Anti-rig: loads testdata/social-cookie-id-fixtures.json (GENERATED by the real
+// secubox_toolbox.social.cookie_id_hash) and asserts cookieIDHash reproduces
+// every `expect` byte-for-byte — Python is the source of truth, exactly like the
+// jar parity harness. The Python side is tests/test_social_parity.py.
+//
+// The rest exercises the ported decision surface: deny-list, registrableSocial
+// (the addon flavour, NOT policy.registrable), the 3rd-party Set-Cookie + Cookie
+// edge extraction, consent_state classification, and the relay buffer/flush.
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+type socialCookieFixture struct {
+	TrackerDomain string `json:"tracker_domain"`
+	CookieName    string `json:"cookie_name"`
+	CookieValue   string `json:"cookie_value"`
+	Expect        string `json:"expect"`
+	Why           string `json:"why"`
+}
+
+type socialCookieFile struct {
+	Fixtures []socialCookieFixture `json:"fixtures"`
+}
+
+// TestCookieIDHashParity: cookieIDHash == the Python-generated expect for every
+// fixture. This is the anti-rig that proves the Go hash is byte-identical to
+// social.cookie_id_hash (lower-case domain+name, raw value, NUL separators).
+func TestCookieIDHashParity(t *testing.T) {
+	dir := testdataDir(t)
+	raw, err := os.ReadFile(filepath.Join(dir, "social-cookie-id-fixtures.json"))
+	if err != nil {
+		t.Fatalf("read social fixtures: %v", err)
+	}
+	var f socialCookieFile
+	if err := json.Unmarshal(raw, &f); err != nil {
+		t.Fatalf("parse social fixtures: %v", err)
+	}
+	if len(f.Fixtures) == 0 {
+		t.Fatal("no social cookie-id fixtures")
+	}
+	for _, fx := range f.Fixtures {
+		got := cookieIDHash(fx.TrackerDomain, fx.CookieName, fx.CookieValue)
+		if got != fx.Expect {
+			t.Errorf("cookieIDHash(%q,%q,%q)=%q want %q  (%s)",
+				fx.TrackerDomain, fx.CookieName, fx.CookieValue, got, fx.Expect, fx.Why)
+		}
+	}
+}
+
+// TestCookieIDHashFolding: domain+name are lower-cased but the value is NOT —
+// the explicit invariant the store contract pins.
+func TestCookieIDHashFolding(t *testing.T) {
+	if cookieIDHash("DoubleClick.NET", "IDE", "AbC") != cookieIDHash("doubleclick.net", "ide", "AbC") {
+		t.Error("domain+name must be case-folded")
+	}
+	if cookieIDHash("d.net", "n", "AbC") == cookieIDHash("d.net", "n", "abc") {
+		t.Error("value must NOT be case-folded")
+	}
+}
+
+func TestIsDenyListed(t *testing.T) {
+	deny := []string{"PHPSESSID", "session", " csrftoken ", "__cf_bm", "consent", "locale", "", "   "}
+	for _, n := range deny {
+		if !isDenyListed(n) {
+			t.Errorf("isDenyListed(%q) = false, want true", n)
+		}
+	}
+	allow := []string{"IDE", "_ga", "_fbp", "uid", "datr"}
+	for _, n := range allow {
+		if isDenyListed(n) {
+			t.Errorf("isDenyListed(%q) = true, want false", n)
+		}
+	}
+}
+
+// TestRegistrableSocial: the addon flavour — IP literals pass through (NOT ""),
+// no port strip semantics needed, the larger multi-label table.
+func TestRegistrableSocial(t *testing.T) {
+	cases := map[string]string{
+		"www.lemonde.fr":        "lemonde.fr",
+		"cdn.api.example.co.uk": "example.co.uk",
+		"tracker.com":           "tracker.com",
+		"a.b.c.doubleclick.net": "doubleclick.net",
+		"WWW.Example.COM":       "example.com",
+		"sub.example.com.au":    "example.com.au",
+		"192.168.1.1":           "192.168.1.1", // IP literal as-is (addon), store drops later
+		".trailing.dot.net.":    "dot.net",
+		"single":                "single",
+		"":                      "",
+	}
+	for in, want := range cases {
+		if got := registrableSocial(in); got != want {
+			t.Errorf("registrableSocial(%q)=%q want %q", in, got, want)
+		}
+	}
+}
+
+func TestParseSetCookieNameValue(t *testing.T) {
+	cases := []struct {
+		in          string
+		name, value string
+		ok          bool
+	}{
+		{"IDE=AHWqTUm; Domain=.doubleclick.net; Path=/", "IDE", "AHWqTUm", true},
+		{"  _ga = GA1.2.3 ; Max-Age=63", "_ga", "GA1.2.3", true},
+		{"Secure; HttpOnly", "", "", false},
+		{"=novalue", "", "", false},
+		{"empty=", "empty", "", true},
+	}
+	for _, c := range cases {
+		n, v, ok := parseSetCookieNameValue(c.in)
+		if n != c.name || v != c.value || ok != c.ok {
+			t.Errorf("parseSetCookieNameValue(%q)=(%q,%q,%v) want (%q,%q,%v)", c.in, n, v, ok, c.name, c.value, c.ok)
+		}
+	}
+}
+
+func TestExtractSetCookieDomainAttr(t *testing.T) {
+	cases := map[string]string{
+		"IDE=x; Domain=.doubleclick.net; Path=/": "doubleclick.net",
+		"a=b; domain=Example.COM":                "example.com",
+		"a=b; Path=/":                            "",
+		"a=b":                                    "",
+		"a=domainlike=1; Path=/":                 "", // value containing "domain" is not the attr
+	}
+	for in, want := range cases {
+		if got := extractSetCookieDomainAttr(in); got != want {
+			t.Errorf("extractSetCookieDomainAttr(%q)=%q want %q", in, got, want)
+		}
+	}
+}
+
+func TestSrcSiteFromReferer(t *testing.T) {
+	req := httptest.NewRequest("GET", "https://tracker.io/p.gif", nil)
+	if got := srcSiteFromReferer(req); got != "" {
+		t.Errorf("no referer → %q want \"\"", got)
+	}
+	req.Header.Set("Referer", "https://www.lemonde.fr/article?x=1")
+	if got := srcSiteFromReferer(req); got != "lemonde.fr" {
+		t.Errorf("referer → %q want lemonde.fr", got)
+	}
+	req.Header.Del("Referer")
+	req.Header.Set("Origin", "https://news.example.co.uk")
+	if got := srcSiteFromReferer(req); got != "example.co.uk" {
+		t.Errorf("origin fallback → %q want example.co.uk", got)
+	}
+}
+
+// helper: build a response with the given Set-Cookie lines.
+func respWithSetCookies(lines ...string) *http.Response {
+	h := http.Header{}
+	for _, l := range lines {
+		h.Add("Set-Cookie", l)
+	}
+	return &http.Response{Header: h}
+}
+
+// TestSocialEdgesThirdParty: a 3rd-party Set-Cookie (Domain= a different eTLD+1)
+// on a 1st-party page yields one edge with the right src_site/tracker_domain.
+func TestSocialEdgesThirdParty(t *testing.T) {
+	req := httptest.NewRequest("GET", "https://ads.doubleclick.net/pixel", nil)
+	resp := respWithSetCookies("IDE=AHWqTUm; Domain=.doubleclick.net; Path=/")
+	// reqHost is the responding host (doubleclick) — but src_site is also derived
+	// from it; so to model a TRUE 3rd-party we use the Domain attr differing from
+	// the request host's registrable. Here both are doubleclick.net → 1st-party,
+	// expect NO edge.
+	edges := socialEdgesFor("machash1", req, resp, "ads.doubleclick.net", "https://ads.doubleclick.net/pixel", "", newConsentLog())
+	if len(edges) != 0 {
+		t.Fatalf("1st-party Set-Cookie should yield 0 edges, got %d", len(edges))
+	}
+
+	// Now a genuine 3rd-party: the page host is lemonde.fr, a Set-Cookie with
+	// Domain=.doubleclick.net (the embedded tracker setting on its own domain via
+	// the request being to doubleclick but src derived from referer is the
+	// request-cookie path; the Set-Cookie path uses reqHost as src). Model the
+	// addon's Set-Cookie path: reqHost=lemonde.fr, Domain attr=doubleclick.net.
+	resp2 := respWithSetCookies("IDE=AHWqTUm; Domain=.doubleclick.net; Path=/")
+	edges = socialEdgesFor("machash1", req, resp2, "www.lemonde.fr", "https://www.lemonde.fr/", "", newConsentLog())
+	if len(edges) != 1 {
+		t.Fatalf("3rd-party Set-Cookie should yield 1 edge, got %d", len(edges))
+	}
+	e := edges[0]
+	if e.SrcSite != "lemonde.fr" || e.TrackerDomain != "doubleclick.net" {
+		t.Errorf("edge src/tracker = %q/%q want lemonde.fr/doubleclick.net", e.SrcSite, e.TrackerDomain)
+	}
+	if e.CookieIDHashVal != cookieIDHash("doubleclick.net", "IDE", "AHWqTUm") {
+		t.Errorf("edge cookie id hash mismatch: %q", e.CookieIDHashVal)
+	}
+	if e.ConsentState != "none_seen" {
+		t.Errorf("consent_state = %q want none_seen", e.ConsentState)
+	}
+}
+
+// TestSocialEdgesDenyAndIP: deny-listed names produce no edge; IP-literal hosts
+// produce no edge (registrableSocial returns the IP, store drops it — but src
+// derivation: an IP src_site == IP tracker → not 3rd party anyway).
+func TestSocialEdgesDenyAndIP(t *testing.T) {
+	req := httptest.NewRequest("GET", "https://x/", nil)
+	resp := respWithSetCookies("PHPSESSID=abc; Domain=.doubleclick.net")
+	edges := socialEdgesFor("m", req, resp, "www.lemonde.fr", "https://www.lemonde.fr/", "", newConsentLog())
+	if len(edges) != 0 {
+		t.Fatalf("deny-listed cookie should yield 0 edges, got %d", len(edges))
+	}
+	// empty mac hash → no edges (R3-only gate)
+	if e := socialEdgesFor("", req, respWithSetCookies("IDE=x; Domain=.doubleclick.net"), "www.lemonde.fr", "u", "", newConsentLog()); len(e) != 0 {
+		t.Fatalf("empty macHash should yield 0 edges, got %d", len(e))
+	}
+}
+
+// TestSocialEdgesRequestCookiePath: a request TO a tracker carrying a Cookie,
+// with a Referer to a different 1st-party, yields an edge attributed to the
+// referer's site.
+func TestSocialEdgesRequestCookiePath(t *testing.T) {
+	req := httptest.NewRequest("GET", "https://ads.doubleclick.net/px", nil)
+	req.Header.Set("Cookie", "IDE=AHWqTUm; session=secret")
+	req.Header.Set("Referer", "https://www.lemonde.fr/article")
+	// No Set-Cookie in the response; src_site = registrableSocial(reqHost) =
+	// doubleclick.net; the Set-Cookie loop emits nothing; the request-Cookie tail
+	// uses ctxSite=lemonde.fr (referer) != tracker doubleclick.net → edge. The
+	// deny-listed `session` cookie is skipped, so exactly 1 edge (IDE).
+	edges := socialEdgesFor("m", req, &http.Response{Header: http.Header{}}, "ads.doubleclick.net", "https://ads.doubleclick.net/px", "", newConsentLog())
+	if len(edges) != 1 {
+		t.Fatalf("request-cookie path should yield 1 edge, got %d", len(edges))
+	}
+	if edges[0].SrcSite != "lemonde.fr" || edges[0].TrackerDomain != "doubleclick.net" {
+		t.Errorf("edge = %q/%q want lemonde.fr/doubleclick.net", edges[0].SrcSite, edges[0].TrackerDomain)
+	}
+}
+
+// TestConsentLog: loader fragment → pre_consent; CMP cookie → post_consent.
+func TestConsentLog(t *testing.T) {
+	cl := newConsentLog()
+	if got := cl.stateFor("m", "lemonde.fr"); got != "none_seen" {
+		t.Errorf("fresh → %q want none_seen", got)
+	}
+	// CMP loader request observed (no consent cookie yet) → pre_consent.
+	cl.update("m", "lemonde.fr", "https://cdn.cookielaw.org/consent/scripttemplates/otSDKStub.js", nil)
+	if got := cl.stateFor("m", "lemonde.fr"); got != "pre_consent" {
+		t.Errorf("after CMP loader → %q want pre_consent", got)
+	}
+	// CMP consent cookie observed → post_consent.
+	cl.update("m", "lemonde.fr", "https://www.lemonde.fr/", []string{"OptanonConsent=isGpcEnabled=0; Path=/"})
+	if got := cl.stateFor("m", "lemonde.fr"); got != "post_consent" {
+		t.Errorf("after CMP cookie → %q want post_consent", got)
+	}
+}
+
+// TestSocialRelayFlush: the buffer batches edges and flushOnce POSTs them to the
+// portal /__toolbox/social-event, then clears.
+func TestSocialRelayFlush(t *testing.T) {
+	var got socialEventPayload
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/__toolbox/social-event" {
+			t.Errorf("unexpected path %q", r.URL.Path)
+		}
+		_ = json.NewDecoder(r.Body).Decode(&got)
+		w.WriteHeader(204)
+	}))
+	defer srv.Close()
+
+	s := newSocialRelay()
+	s.add(socialEdge{ClientMacHash: "m", SrcSite: "a.fr", TrackerDomain: "t.com", CookieIDHashVal: "deadbeef", ConsentState: "none_seen"})
+	p := s.flushOnce(srv.URL)
+	if len(p.Edges) != 1 || len(got.Edges) != 1 {
+		t.Fatalf("flush sent %d / server got %d, want 1/1", len(p.Edges), len(got.Edges))
+	}
+	if got.Edges[0].TrackerDomain != "t.com" {
+		t.Errorf("server edge tracker = %q want t.com", got.Edges[0].TrackerDomain)
+	}
+	// Buffer cleared: a second flush sends nothing.
+	if p2 := s.flushOnce(srv.URL); !p2.empty() {
+		t.Errorf("second flush should be empty, got %d edges", len(p2.Edges))
+	}
+}
+
+// TestSocialRelayCap: the buffer never exceeds socialBatchCap.
+func TestSocialRelayCap(t *testing.T) {
+	s := newSocialRelay()
+	for i := 0; i < socialBatchCap+100; i++ {
+		s.add(socialEdge{ClientMacHash: "m", SrcSite: "a", TrackerDomain: "t", CookieIDHashVal: "h", ConsentState: "none_seen"})
+	}
+	if got := s.snapshot(); len(got.Edges) != socialBatchCap {
+		t.Errorf("buffer held %d edges, want cap %d", len(got.Edges), socialBatchCap)
+	}
+}
diff --git a/packages/secubox-toolbox-ng/debian/changelog b/packages/secubox-toolbox-ng/debian/changelog
index 0ea686fe..a56c4823 100644
--- a/packages/secubox-toolbox-ng/debian/changelog
+++ b/packages/secubox-toolbox-ng/debian/changelog
@@ -1,3 +1,22 @@
+secubox-toolbox-ng (0.1.11-1~bookworm1) bookworm; urgency=medium
+
+  * social: ALSO correlate on the block path — blocked 3rd-party trackers still
+    carry the browser's request Cookie (the cross-site evidence); without this
+    the /social graph misses the very trackers it exists to expose (they're 204'd
+    before the allow/mitm correlation). resp=nil request-only, hash-only. (ref #662)
+
+ -- Gerald KERMA <devel@cybermind.fr>  Thu, 19 Jun 2026 11:55:00 +0000
+
+secubox-toolbox-ng (0.1.10-1~bookworm1) bookworm; urgency=medium
+
+  * social: faithfully port the in-process social_graph correlation — the engine
+    computes cross-site tracker edges (byte-exact cookie_id_hash, deny-list,
+    eTLD+1 3rd-party check, CMP consent_state) and relays HASH-ONLY edges
+    (never raw values, WG-only) to the new portal /__toolbox/social-event →
+    social.record_edge → /social graph un-frozen. --social-relay (default on). (ref #662)
+
+ -- Gerald KERMA <devel@cybermind.fr>  Thu, 19 Jun 2026 11:30:00 +0000
+
 secubox-toolbox-ng (0.1.9-1~bookworm1) bookworm; urgency=medium
 
   * telemetry: relay per-flow metadata to the analysis sidecars (dpi /classify,
diff --git a/packages/secubox-toolbox-ng/testdata/social-cookie-id-fixtures.json b/packages/secubox-toolbox-ng/testdata/social-cookie-id-fixtures.json
new file mode 100644
index 00000000..ddbf2da0
--- /dev/null
+++ b/packages/secubox-toolbox-ng/testdata/social-cookie-id-fixtures.json
@@ -0,0 +1,61 @@
+{
+  "_comment": "Cross-engine parity fixtures for social.cookie_id_hash (#662). GENERATED by the real secubox_toolbox.social.cookie_id_hash (Python = source of truth); the Go cookieIDHash MUST reproduce every `expect` byte-for-byte. Note: tracker_domain + cookie_name are LOWER-cased before hashing, the cookie_value is NOT; NUL (0x00) separators; UTF-8 with 'replace' errors. See tests/test_social_parity.py (Python) ↔ social_test.go (Go).",
+  "fixtures": [
+    {
+      "tracker_domain": "doubleclick.net",
+      "cookie_name": "IDE",
+      "cookie_value": "AHWqTUm123",
+      "expect": "8e7fadaeb2584768",
+      "why": "plain ascii"
+    },
+    {
+      "tracker_domain": "DoubleClick.NET",
+      "cookie_name": "ide",
+      "cookie_value": "AHWqTUm123",
+      "expect": "8e7fadaeb2584768",
+      "why": "domain+name UPPER folded, value verbatim -> identical hash to #1 (proves domain+name are lower-cased)"
+    },
+    {
+      "tracker_domain": "doubleclick.net",
+      "cookie_name": "IDE",
+      "cookie_value": "ahwqtum123",
+      "expect": "550317c9729652c2",
+      "why": "value lower-cased DIFFERS from #1 (proves the VALUE is NOT folded)"
+    },
+    {
+      "tracker_domain": "ads.example.com",
+      "cookie_name": "_ga",
+      "cookie_value": "GA1.2.999.111",
+      "expect": "89a398ebd72ee863",
+      "why": "GA cookie"
+    },
+    {
+      "tracker_domain": "tracker.io",
+      "cookie_name": "uid",
+      "cookie_value": "Ünîcødé✓",
+      "expect": "3b4923e9d9bb77a2",
+      "why": "unicode value (utf-8 encoded)"
+    },
+    {
+      "tracker_domain": "tracker.io",
+      "cookie_name": "Ünîcödé",
+      "cookie_value": "val",
+      "expect": "d4db5a0d71216313",
+      "why": "unicode cookie NAME (lower-cased + utf-8)"
+    },
+    {
+      "tracker_domain": "",
+      "cookie_name": "x",
+      "cookie_value": "y",
+      "expect": "2081f4f26135019e",
+      "why": "empty domain still hashes (NUL separators)"
+    },
+    {
+      "tracker_domain": "d.net",
+      "cookie_name": "n",
+      "cookie_value": "",
+      "expect": "b0da6b889cb198a1",
+      "why": "empty value"
+    }
+  ]
+}
diff --git a/packages/secubox-toolbox/secubox_toolbox/api.py b/packages/secubox-toolbox/secubox_toolbox/api.py
index 822498cc..35387443 100644
--- a/packages/secubox-toolbox/secubox_toolbox/api.py
+++ b/packages/secubox-toolbox/secubox_toolbox/api.py
@@ -138,6 +138,87 @@ async def toolbox_ad_event(request: Request) -> Response:
         log.debug("ad-event ingest failed: %s", e)
     return Response(status_code=204)
 
+
+# #662 — cross-site cookie-tracker edge ingest from the Go MITM engine (sbxmitm).
+# The #662 Phase-7 cutover decommissioned the in-process Python social_graph addon
+# that fed social.record_edge(), so the kbin /social graph (social_edges →
+# social_nodes/social_links) froze. The engine now computes the SAME 3rd-party
+# cookie-tracker edges (FAITHFUL port of social_graph.py: deny-list, eTLD+1
+# 3rd-party check, cookie_id_hash, CMP consent_state) and POSTs a batch here. We
+# call social.record_edge() per row, which writes raw social_edges; the existing
+# app.py social_fold_loop folds them into nodes/links.
+#
+# Raw cookie VALUES never reach this endpoint — only the truncated cookie_id_hash
+# (privacy/CSPN; this is exactly why the original ran in-process).
+#
+# UNAUTHENTICATED, same trust note as /__toolbox/ad-event: the engine reaches the
+# portal only over the R3 nft perimeter (loopback / WG ingress).
+_SOCIAL_EVENT_ROW_CAP = 5000  # bound the edge list so a misbehaving engine can't flood us
+_SOCIAL_FOLD_DEBOUNCE = 60  # seconds: floor between in-handler safety folds
+_social_last_fold = 0.0  # module-level throttle timestamp
+
+
+@router.post("/__toolbox/social-event")
+async def toolbox_social_event(request: Request) -> Response:
+    """Ingest a batch of cross-site tracker edges from the Go engine. Best-effort:
+    never 500s the engine (it is fire-and-forget) — always returns 204. See the
+    trust note above for why this is unauthenticated."""
+    global _social_last_fold
+    try:
+        # Body-size guard BEFORE parsing (mirrors /__toolbox/ad-event): the legit
+        # payload (≤5000 edges) is well under 2 MB; reject larger outright so a
+        # misbehaving/compromised WG peer can't pressure portal memory.
+        try:
+            clen = int(request.headers.get("content-length") or 0)
+        except (TypeError, ValueError):
+            clen = 0
+        if clen > 2 * 1024 * 1024:
+            return Response(status_code=204)
+        body = await request.json()
+        if not isinstance(body, dict):
+            return Response(status_code=204)
+        edges = body.get("edges") or []
+        if not isinstance(edges, list):
+            edges = []
+        edges = edges[:_SOCIAL_EVENT_ROW_CAP]
+
+        from . import social as _social
+
+        recorded = 0
+        for e in edges:
+            if not isinstance(e, dict):
+                continue
+            try:
+                _social.record_edge(
+                    client_mac_hash=e.get("client_mac_hash") or "",
+                    src_site=e.get("src_site") or "",
+                    tracker_domain=e.get("tracker_domain") or "",
+                    cookie_id_hash_val=e.get("cookie_id_hash_val") or "",
+                    ja4_hash=e.get("ja4_hash") or None,
+                    consent_state=e.get("consent_state") or "none_seen",
+                )
+                recorded += 1
+            except Exception as row_err:  # one bad row never fails the batch
+                log.debug("social-event row failed: %s", row_err)
+
+        # Safety fold: the app.py social_fold_loop already folds every 5 min, but
+        # fold here too (debounced to ≤ once / 60 s via a module-level timestamp)
+        # so a freshly-ingested edge surfaces in the d3 graph promptly even between
+        # loop ticks. Cheap (indexed window scan) and self-throttling; a fold
+        # failure is swallowed (the loop will catch up).
+        if recorded:
+            now = time.time()
+            if now - _social_last_fold >= _SOCIAL_FOLD_DEBOUNCE:
+                _social_last_fold = now
+                try:
+                    _social.fold_recent(window_seconds=600)
+                except Exception as fold_err:
+                    log.debug("social-event fold failed: %s", fold_err)
+    except Exception as e:  # never raise into the engine's fire-and-forget POST
+        log.debug("social-event ingest failed: %s", e)
+    return Response(status_code=204)
+
+
 # Cap geo/UA enrichment on /admin/clients/rich to the rows the UI actually shows
 # (top-5 + headroom). Beyond this, clients get bare fields — avoids ~51 cached
 # geo lookups per poll (ref #644).
diff --git a/packages/secubox-toolbox/tests/test_social_parity.py b/packages/secubox-toolbox/tests/test_social_parity.py
new file mode 100644
index 00000000..16be5ffc
--- /dev/null
+++ b/packages/secubox-toolbox/tests/test_social_parity.py
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: LicenseRef-CMSD-1.0
+# Copyright (c) 2026 CyberMind — Gérald Kerma <devel@cybermind.fr>
+"""Cross-engine SOCIAL parity harness — Python side (#662).
+
+Loads the SAME ``social-cookie-id-fixtures.json`` the Go core uses
+(``../secubox-toolbox-ng/testdata``) and asserts ``social.cookie_id_hash``
+reproduces each fixture's ``expect``.
+
+Python is the source of truth: the ``expect`` values were GENERATED by this very
+``social.cookie_id_hash``. The Go side (cmd/sbxmitm/social_test.go) must
+reproduce them byte-for-byte. Both files reading identical inputs is what makes
+the parity meaningful — the same anti-rig discipline as the jar parity harness.
+"""
+from __future__ import annotations
+
+import json
+import os
+
+from secubox_toolbox import social
+
+_HERE = os.path.dirname(os.path.abspath(__file__))
+# tests/ → packages/secubox-toolbox → packages → packages/secubox-toolbox-ng
+_NG_TESTDATA = os.path.normpath(
+    os.path.join(_HERE, "..", "..", "secubox-toolbox-ng", "testdata"))
+_FIXTURES = os.path.join(_NG_TESTDATA, "social-cookie-id-fixtures.json")
+
+
+def _load():
+    with open(_FIXTURES, encoding="utf-8") as f:
+        return json.load(f)
+
+
+def test_cookie_id_hash_parity():
+    data = _load()
+    assert data["fixtures"], "no fixtures"
+    failures = []
+    for fx in data["fixtures"]:
+        got = social.cookie_id_hash(
+            fx["tracker_domain"], fx["cookie_name"], fx["cookie_value"])
+        if got != fx["expect"]:
+            failures.append((fx, got))
+    assert not failures, f"cookie_id_hash drift: {failures}"
+
+
+def test_cookie_id_hash_invariants():
+    # domain + name are lower-cased; the value is NOT.
+    assert social.cookie_id_hash("A.NET", "N", "v") == social.cookie_id_hash("a.net", "n", "v")
+    assert social.cookie_id_hash("a.net", "n", "V") != social.cookie_id_hash("a.net", "n", "v")